/**************************************************************************************************
 * light library                                                                                  *
 * Copyright © 2012 David Kretzmer                                                                *
 *                                                                                                *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software  *
 * and associated documentation files (the "Software"), to deal in the Software without           *
 * restriction,including without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute,sublicense, and/or sell copies of the Software, and to permit persons to whom the   *
 * Software is furnished to do so, subject to the following conditions:                           *
 *                                                                                                *
 * The above copyright notice and this permission notice shall be included in all copies or       *
 * substantial portions of the Software.                                                          *
 *                                                                                                *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING  *
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND     *
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, *
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.        *
 *                                                                                                *
 *************************************************************************************************/

#include "light/light.hpp"

#ifdef LIGHT_PLATFORM_WINDOWS

#include "light/chrono/hires_clock.hpp"

#define WIN32_LEAN_AND_MEAN
#include "Windows.h"


namespace light
{
namespace chrono
{
	float8 hires_clock::hardware_resolution()
	{
		LARGE_INTEGER freq;
		QueryPerformanceFrequency(&freq);

		return float8(freq.QuadPart);
	}

	hires_clock::time_point hires_clock::now()
	{
		using namespace std::chrono;

		static float8 const  duration = 1.0 / hires_clock::hardware_resolution();
		static float8 const duration_nano = float8(hires_clock::period::num) / float8(hires_clock::period::den);
		static float8 const scale = duration / duration_nano;

		LARGE_INTEGER counter;
		QueryPerformanceCounter(&counter);
		
		auto time = nanoseconds(uint8(counter.QuadPart * scale));
		return time_point(time);
	}

} // namespace: chrono
} // namespace: light


#endif // conditional compilation: LIGHT_PLATFORM_WINDOWS
